What is a Cool Tube?
A Cool Tube is basically a glass tube with a light bulb connector within it. Both extremities are opened allowing you to place extracting tubes in them in order to connect the extractor and air filter if needed.
The main use for a Cool Tube is to contain the heat generated by the light bulbs within it, enabling the grower to extract it right away out of the grow room.
On average the temperature will drop about 2/3°C within the grow room. Another great advantage is that, with less heat generated by the light bulb, you’ll be able to get it much closer to the top of the plants, increasing light penetration while avoiding burning the tips of the buds.